Patents by Inventor Kyousuke Dohi

Kyousuke Dohi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for closing fluid passage, and water hammerless valve device and water hammerless closing device used in the method
    Patent number: 8020574
    Abstract: A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps? of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps? capable of bringing the vibration detection signal Pr substantially to zero.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: September 20, 2011
    Assignees: Fujikin Incorporated
    Inventors: Tadahiro Ohmi, Nobukazu Ikeda, Kouji Nishino, Masaaki Nagase, Kyousuke Dohi, Ryutaro Nishimura
  • METHOD FOR CLOSING FLUID PASSAGE, AND WATER HAMMERLESS VALVE DEVICE AND WATER HAMMERLESS CLOSING DEVICE USED IN THE METHOD
    Publication number: 20080035877
    Abstract: A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps? of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps? capable of bringing the vibration detection signal Pr substantially to zero.
    Type: Application
    Filed: June 14, 2007
    Publication date: February 14, 2008
    Applicants: FUJIKIN INCORPORATED
    Inventors: Tadahiro OHMI, Nobukazu Ikeda, Kouji Nishino, Masaaki Nagase, Kyousuke Dohi, Ryutaro Nishimura
  • Method for closing fluid passage, and water hammerless valve device and water hammerless closing device used in the method
    Patent number: 7080658
    Abstract: A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps? of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps? capable of bringing the vibration detection signal Pr substantially to zero.
    Type: Grant
    Filed: June 15, 2005
    Date of Patent: July 25, 2006
    Assignees: Fujikin Incorporated
    Inventors: Tadahiro Ohmi, Nobukazu Ikeda, Kouji Nishino, Masaaki Nagase, Kyousuke Dohi, Ryutaro Nishimura
  • Method for closing fluid passage, and water hammerless valve device and water hammerless closing device used in the method
    Publication number: 20050241697
    Abstract: A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps? of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps? capable of bringing the vibration detection signal Pr substantially to zero.
    Type: Application
    Filed: June 15, 2005
    Publication date: November 3, 2005
    Applicants: Fujikin Incorporated, Tadahiro OHMI
    Inventors: Tadahiro Ohmi, Nobukazu Ikeda, Kouji Nishino, Masaaki Nagase, Kyousuke Dohi, Ryutaro Nishimura